Reggie Perrin
Inactive
So I just picked up a BSA "Martini Cadet". Like many of them in the US, the barrel was rechambered from the original .310 Greener to .32-20 when it was imported.
According to multiple sources on the internet, BSA Cadets are supposed to have a groove diameter of .316", and firing factory .32-20 in these guns is only to be done if you enjoy inaccuracy and bore leading.
I wanted to slug the bore to verify its dimensions before ordering a mold. Something I don't remember any of the stuff I read about these guns mentioning is the fact that this thing has five groove rifling.
As someone who does not own a machine shop with thousands of dollars worth of specialized measuring equipment, how does one go about measuring a slug from a five groove barrel? Is there a simple way to determine the actual groove diameter?
According to multiple sources on the internet, BSA Cadets are supposed to have a groove diameter of .316", and firing factory .32-20 in these guns is only to be done if you enjoy inaccuracy and bore leading.
I wanted to slug the bore to verify its dimensions before ordering a mold. Something I don't remember any of the stuff I read about these guns mentioning is the fact that this thing has five groove rifling.
As someone who does not own a machine shop with thousands of dollars worth of specialized measuring equipment, how does one go about measuring a slug from a five groove barrel? Is there a simple way to determine the actual groove diameter?